环空钻柱结构三维非线性分析
Three-Dimensional Nonlinear Analysis of drill String Structure in Annulus
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摘要: 应用有限元理论和牛顿-拉裴逊法对弯曲井眼中环空钻柱结构进行非线性分析。根据变形特点,提出了对不同参量采用不同形式的单元的描述计算分析方法。采用罚函数法处理待定边界问题。计算表明了井眼曲率对钻头侧向力的非线性效应。Abstract: Three-dimensional nonlinear analysis of drill string structure in annulus of curvedwellbore is done by using the theory of finite element and Newton-Raphson method.According to the characteristics of its deformation,a method of the description andcomputation of taking different forms of elements for different parameters is advanced.The penalty function method is applied for finding the unknown boundary.the nonlinear effects of curvature of wellbore on the side forces on bit ae shown by the computation.
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Key words:
- Newton-Raphson method /
- penalty function method /
- nonlineareffect /
- drill string
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